Polyolefins can be cracked under heat to produce low molecular weight compounds, such as gases, liquids, and solids. Gases can be used as gas, liquids are used as gasoline, diesel, etc., and solids are used as paving materials. In the presence of a catalyst, the cracking mechanism or cracking rate is altered to cause changes in product components. The polyolefin decomposes in the presence of a catalyst, and its decomposition rate is greatly increased. For example, when PE has a zeolite catalyst in the molten salt decomposition furnace, it decomposes at 420-580c, and the decomposition rate thereof is increased by 2 to 7 times. The presence of the catalyst also affects the product components. The catalyst was used to crack the polymer waste PE. It was found that the presence of the catalyst can reduce the residue of the polymer cracking, that is, the catalyst easily causes the polymer to produce low molecular weight compounds.
It may accelerate the cracking rate, and may also change the cracking mechanism. At the same time, it is found that the alkaline catalyst is prone to generate unsaturated hydrocarbons, and some acidic catalysts are not easy to generate unsaturated hydrocarbons.
Waste PE and PP polymers can be cracked at high temperatures (>35012), and the cracking products vary with temperature. When the cracking temperature is 800 °C, most of the thermal decomposition products are ethylene, propylene and methane; at moderate temperatures between 400 and 50012, the thermal decomposition products have liquid, gas and solid residues, of which gas accounts for 20% to 40%, liquid 35% to 70%, residue 10% to 30%; cracking at lower temperatures produces more high boiling hydrocarbon compounds or oligomers. As the temperature increases, the content of the low molecular weight substance increases, and it is a gas at normal temperature.
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Household Automatic Balanced Door
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